The following is a brief summary of events regarding a fatal Gaithersburg collision that occurred on Friday night in the area of Great Seneca Highway and Kentlands Blvd. “Preliminarily, at approximately 9:17 p.m., Gaithersburg and Montgomery County Police 6th district officers responded to the area of Great Seneca Hwy and Kentlands Blvd. An adult female was located in the roadway.